Assessment of personal exposure to ozone in asthmatic children residing in Mexico City
Objective. A study was conducted to evaluate personal ozone exposure (O3p) among asthmatic children residing inMexico City. Material and Methods. A total of 158 children were recruited from December 1998 to April 2000. On average, three O3p measurements were obtained per child using passive badges....
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | México |
| Institución: | Instituto Nacional de Salud Pública |
| Repositorio: | Redalyc-INSP |
| OAI Identifier: | oai:redalyc.org:10650110 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=10650110 |
| Access Level: | acceso abierto |
| Palabra clave: | Salud ozone asthmatics Mexico City activity patterns Personal measurements |
| Sumario: | Objective. A study was conducted to evaluate personal ozone exposure (O3p) among asthmatic children residing inMexico City. Material and Methods. A total of 158 children were recruited from December 1998 to April 2000. On average, three O3p measurements were obtained per child using passive badges. Time-activity patterns were recorded in a diary. Daily ambient ozone measurements (O3a) were obtained from the fixed station, according to children's residence.Levels of O3a and ozone, weighted by time spent in different micro-environments (O3w), were used as independent variables in order to model O3p concentrations using a mixed-effects model. Results. Mean O3p was 7.8 ppb. The main variables in the model were: time spent indoors, distance between residence and fixed station, follow-up group, and two interaction terms (overall R2=0.50, p<0.05). Conclusions. The O3w concentrations can be used as a proxy for O3p, taking into account time-activity patterns and the place of residence of asthmatic Mexican children. |
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